leaching kinetics on enhancing process to extract

leaching kinetics on enhancing process to extract

  • Enhancing the kinetics of chalcopyrite leaching in the ...

    2011-01-01  As little as 50 ppm Ag on pyrite, or 50 g Ag (about 1.5 troy ounces) per tonne of pyrite, is sufficient to ensure rapid chalcopyrite leaching kinetics in the Galvanox™ process. The ability of silver to catalyze copper dissolution from chalcopyrite in both chemical and biological leaching systems is

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  • Enhancing the kinetics of pyrite catalyzed leaching of ...

    An investigation has been conducted into the kinetics of chalcopyrite leaching in acidic ferric/ferrous sulfate media at atmospheric pressure and low temperature in the presence of pyrite. It has been found that pyrite samples from different sources affect the rate of chalcopyrite leaching differently. Some pyrite samples accelerate the rate significantly while others have little or no ...

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  • Leaching of gold from a free milling gold ore in copper ...

    2020-08-15  The oxygen pressure thiosulfate leaching process without the use of ammonia and copper has been successfully used to leach gold from ores (Ji et al., 2003, Yang et al., 2019). This process is beneficial to the gold recovery from leaching solutions using an anion exchange resin.

  • Cited by: 1
  • Leaching Kinetics of Vanadium from Calcium-Roasting High ...

    Electro-oxidation technology has been applied to enhance the leaching process of calcium-roasting high-chromium vanadium slag. The effect of parameters that affect the leaching efficiency of vanadium including concentration of sulfur acid, current density, reaction

  • Author: Hao Peng, Jing Guo, Xingran Zhang
  • Metals Special Issue : Leaching Kinetics of Valuable Metals

    Leaching is a primary extractive operation in hydrometallurgical processing, by which a metal of interest is transferred from naturally-occurring minerals into an aqueous solution.

  • Enhancement of the Leaching Rate of Uranium in the ...

    The enhancement of the leaching rate due to ultrasound is found to occur in two steps: (1) MgF2 particle fragmentation leading to high specific solid−liquid interfacial area and by increase in the surface diffusional rate of the reactive species; (2) enhancement in the convective diffusivity of the leach acid solvent through micropores of the MgF2 agglomerate structure due to convective ...

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  • LEACHING KINETICS OF COPPER FROM CHALCOPYRITE

    The kinetics were well correlated with the shrinking core model for the diffusion controlled mechanism with an apparent activation energy of 34.06 kJmol–1. Elemental sulfur was the primary leaching product on the mineral surface, as confirmed using XRD and SEM/EDX.

  • Leaching in Metallurgy and Metal Recovery

    Leaching, by definition, is the process of extracting a substance from a solid material, after it has been in contact with a liquid. The substance being extracted from the solid does so by coming into solution, one which it is soluble in.

  • LEACHING KINETICS OF CU, CO, ZN, PB AND FE FROM COPPER ...

    LEACHING KINETICS OF CU, CO, ZN, PB AND FE FROM COPPER SMELTING SLAGS COOLED IN DIFFERENT WAYS AFTER TAPPING N Tshiongo1, R K K Mbaya1, and K Maweja2 1Department of chemical and metallurgical engineering, Tshwane University of Technology, 2Element Six (pty) Ltd, DRL Abstract Slag samples from a copper smelting operation in a water jacket furnace from a DRC plant

  • Leaching theory and kinetics - BioMineWiki

    Leaching theory and kinetics (Redirected from Leach kinetics) Leaching is a heterogeneous reaction that takes place at the interface between a solid and liquid phase and sometimes also a gaseous phase. At the boundary between the two phases a diffusion layer is formed.

  • Enhancing the kinetics of chalcopyrite leaching in the ...

    Specifically, the effects of pyrite treated with silver (enhanced pyrite) on the kinetics of chalcopyrite leaching were examined with the aim of improving the Galvanox™ process. It has been shown...

  • Enhancement of the Leaching Rate of Uranium in the ...

    In the present work, experiments have been performed for leaching (recovery) of uranium from MgF2 (byproduct from the uranium ore recovery process) under various conditions of leach acid concentration with and without the presence of ultrasound, under different energy dissipation rates (different rotational speeds of conventional stirring by impeller), and on different MgF2 particle size ...

  • Kinetics of Uranium Extraction from Uranium Tailings by ...

    2016-05-23  The extraction kinetics expression was changed from 1 − 3 (1 − α) 2/3 + 2 (1 − α) = K 0 (H 2 SO 4) −0.14903 (S/L) −1.80435 (R o) 0.20023 e −1670.93/T t (t ≥ 5) to 1 − 3 (1 − α) 2/3 + 2 (1 − α) = K 0 (H 2 SO 4) 0.01382 (S/L) −1.83275 (R o) 0.25763 e −1654.59/T t (t ≥ 5) by the addition of H 2 O 2 in the leaching process.

  • Accelerating leaching of copper ore with surfactant and ...

    Request PDF Accelerating leaching of copper ore with surfactant and the analysis of reaction kinetics To solve the problem of low permeability and lower extraction rates of high-mud ores, a ...

  • Alkaline leaching of lead and zinc by sodium hydroxide ...

    According to Table 2, it can be concluded that leaching process of lead and zinc from low-grade oxide ore using sodium hydroxide is controlled by diffusion process. Consequently, the equations representing the kinetics of leaching process of lead and zinc can be expressed as according to Eqs. , respectively.

  • Kinetics of Uranium Extraction from Uranium Tailings by ...

    Results suggest that H 2 O 2 can significantly improve uranium extraction by decomposing the complex gangue structures in uranium tailings and by enhancing the reaction rate between uranium phases and the leaching agent. The extraction kinetics expression was changed from 1 - 3(1 - α) 2/3 + 2(1 - α) = K 0 (H 2 SO 4 ) -0.14903 (S/L) -1.80435 ( R o ) 0.20023 e -1670.93/T t ( t ≥ 5) to 1 - 3 ...

  • Accelerating leaching of copper ore with surfactant and ...

    During the leaching process, the surface tension of the solution did not substantially change, and that of the solution with surfactant increased slightly. The kinetics analysis of ore column leaching illustrated that the leaching processes were controlled by both internal diffusion (principal factor) and chemical reaction.

  • The leaching and adsorption behaviour of gold ores

    to show the effect of preg-robbing on gold extraction from ores of different mineralogy. The effect of preg-robbing was found to be closely related to the kinetics of the preg-robbing and adsorption processes. This batch model was extended to a continuous model that simulated three leaching and seven carbon-in-leach tanks. The effect of ...

  • David Dixon - UBC Materials Engineering

    G. Nazari, D.G. Dixon and D.B. Dreisinger (201 1) Enhancing the kinetics of chalcopyrite leaching in the Galvanoxrn process. Hydrometallurg y 105, 251-258. B.F. Rivera Vasguez and D.G. Dixon (2010) atmospheric leaching of enargite in ferric sulfate media. Hydrometallurg y, accepted May 2010 pending minor revision.

  • MODELING OF GOLD CYANIDATION

    Keywords: Gold cyanidation; Leaching; Reaction kinetics; Modeling The chemistry of gold dissolution in alkaline cyanide solution has continually received attention and new rate equations expressing the gold leaching are still developed. The effect of leaching parameters on gold cyanidation is studied in this work in order to optimize the leaching process. A gold leaching model, based on the ...

  • Kinetics of Uranium Extraction from Uranium Tailings by ...

    2016-05-23  The extraction kinetics expression was changed from 1 − 3 (1 − α) 2/3 + 2 (1 − α) = K 0 (H 2 SO 4) −0.14903 (S/L) −1.80435 (R o) 0.20023 e −1670.93/T t (t ≥ 5) to 1 − 3 (1 − α) 2/3 + 2 (1 − α) = K 0 (H 2 SO 4) 0.01382 (S/L) −1.83275 (R o) 0.25763 e −1654.59/T t (t ≥ 5) by the addition of H 2 O 2 in the leaching process.

  • Kinetics of Uranium Extraction from Uranium Tailings by ...

    Results suggest that H 2 O 2 can significantly improve uranium extraction by decomposing the complex gangue structures in uranium tailings and by enhancing the reaction rate between uranium phases and the leaching agent. The extraction kinetics expression was changed from 1 - 3(1 - α) 2/3 + 2(1 - α) = K 0 (H 2 SO 4 ) -0.14903 (S/L) -1.80435 ( R o ) 0.20023 e -1670.93/T t ( t ≥ 5) to 1 - 3 ...

  • THE KINETICS OF INDONESIAN GALENA CONCENTRATE LEACHING

    By means of these reagents, it is expected that the Pb extraction process from galena concentrate resulted from flotation of sulfide ore can be carried out at low temperatures and lead recovery can be accomplished from the leach solution by electrowining. Studying galena leaching kinetics is required to perform galena leaching with high Pb extraction percentages. Two kinetics models are ...

  • Alkaline leaching of lead and zinc by sodium hydroxide ...

    According to Table 2, it can be concluded that leaching process of lead and zinc from low-grade oxide ore using sodium hydroxide is controlled by diffusion process. Consequently, the equations representing the kinetics of leaching process of lead and zinc can be expressed as according to Eqs. , respectively.

  • Recovery of scandium and neodymium from blast furnace slag ...

    Dry digestion has the advantage of low operating temperature and fast water leaching kinetics with no silica gel formation, but its acid consumption is the highest among the three. 29 Acid roasting has the advantage of low impurity co-extraction, but it involves high operating temperature, slow water leaching kinetics, and silica gel polymerization in some cases. 30 Acid baking has the ...

  • Kinetics of Uranium Extraction from Uranium Tailings by ...

    of leaching residues. Results suggest that H 2O 2 can significantly improve uranium extraction by decomposing the complex gangue structures in ura-nium tailings and by enhancing the reaction rate between uranium phases and the leaching agent. The extraction kinetics expression was changed from 1 3(1 a)2/3 + 2(1 a)=K 0(H 2SO 4) 0.14903(S/L) 1 ...

  • Extraction of Lithium from Lepidolite Using Mixed Grinding ...

    Mixed grinding with Na2S followed by water leaching was performed to extract Li from lepidolite. The leachability of Li increases dramatically in the ground mixture, regardless of the mixing ratio over the range of 1:1 to 3:1, while only 4.53% of Li was extracted in lepidolite ground without Na2S. The leachability increased with an increase of the grinding time, and ultimately, 93% of the Li ...

  • Hydrometallurgy - Wikipedia

    Tank leaching Stirred tank, also called agitation leaching, involves contacting material, which has usually undergone size reduction and classification, with leach solution in agitated tanks. The agitation can enhance reaction kinetics by enhancing mass transfer. Tanks are often configured as reactors in series.

  • The leaching and adsorption behaviour of gold ores

    to show the effect of preg-robbing on gold extraction from ores of different mineralogy. The effect of preg-robbing was found to be closely related to the kinetics of the preg-robbing and adsorption processes. This batch model was extended to a continuous model that simulated three leaching and seven carbon-in-leach tanks. The effect of ...

  • Copper recovery using leach/solvent extraction ...

    compatible with the copper leaching process because it did not extract copper below pH~36. Technically this problem could be solved by neutralizing the acid leach liquor or by leaching oxide copper with ammonia, but neither solution was economical. a molecule that extracted copper well from typical dump leach liquors (pH ~1.8) had to be built. The reagent LIX 64, containing the ketoxime LIX ...

  • The leaching and adsorption behaviour of gold ores

    to show the effect of preg-robbing on gold extraction from ores of different mineralogy. The effect of preg-robbing was found to be closely related to the kinetics of the preg-robbing and adsorption processes. This batch model was extended to a continuous model that simulated three leaching and seven carbon-in-leach tanks. The effect of ...

  • Recovery of scandium and neodymium from blast furnace slag ...

    Dry digestion has the advantage of low operating temperature and fast water leaching kinetics with no silica gel formation, but its acid consumption is the highest among the three. 29 Acid roasting has the advantage of low impurity co-extraction, but it involves high operating temperature, slow water leaching kinetics, and silica gel polymerization in some cases. 30 Acid baking has the ...

  • Pressure oxidation leaching of an enargite concentrate in ...

    with the aim of achieving high copper extraction along with fixation of arsenic in a form that is safe for disposal. The effects of various leaching parameters on copper extraction kinetics from the enargite concentrate have been systematically investigated, including: leaching solution, temperature (130–210 °C), PTFE/enargite mass ratio (from

  • Solvometallurgical process for extraction of copper from ...

    In sulfate media, the leaching kinetics are generally slow (several months) and the leaching of copper is difficult to be complete, due to the formation of passivation layers on the surface of chalcopyrite, such as solid sulfur and iron precipitate (e.g. jarosite). 1 In chloride media, the leaching rate is faster than that in sulfate media, due to the high solubility of salts in chloride media ...

  • Accelerating leaching of copper ore with surfactant and ...

    The kinetics analysis of ore column leaching illustrated that the leaching processes were controlled by both internal diffusion (principal factor) and chemical reaction. To solve the problem of low permeability and lower extraction rates of high-mud ores, a surfactant was added as a penetrant to the pregnant leaching solution during column leaching tests. On the basis of the theories of ...

  • The Metallurgy of Cyanide Gold Leaching – An Introduction ...

    2014-10-20  Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates. Despite the difficulties and hazards of working with cyanide, no other process has yet been proven to be an economic viable alternative. A paper published by L. Elsner in 1846 first correctly identified the chemical reaction that forms the basis ...

  • Kinetics of Uranium Extraction from Uranium Tailings by ...

    of leaching residues. Results suggest that H 2O 2 can significantly improve uranium extraction by decomposing the complex gangue structures in ura-nium tailings and by enhancing the reaction rate between uranium phases and the leaching agent. The extraction kinetics expression was changed from 1 3(1 a)2/3 + 2(1 a)=K 0(H 2SO 4) 0.14903(S/L) 1 ...

  • Kinetics of high pressure leaching of nickel lateritic ore ...

    Kinetics of high pressure leaching of nickel lateritic ore "Silcrete" 1 StopiC, S., Friedrich, B., ... extraction and the concentration of major irripurities during autoclave operation for a wide variety of process conditions and feed compositions. It was implemented in a simulation. The future trend for nickel production is expected to involve the processing of laterites, which account for ...

  • Jetti Services Canada Inc Mitacs

    Bio-heap-leaching is a hydrometallurgical process used to process low grade chalcopyrite ore as the cost of alternative routes of processing and refining are not economically viable. However, a viable solution has been found: to add a catalyst that dramatically enhances the kinetics of leaching while not being too expensive, environmentally detrimental or affecting downstream processes. Jetti ...

  • Kinetic studies on the leaching reactions in the autoclave ...

    compartments 1 to 3, leaching was observed to be preceded by dilution of the repulp liquor (copper raffinate). The leaching rate for compartment 5 was slightly lower than that of compartment 1 but higher than the rates of compartments 2, 3, and 4 for all the metals studied. Keywords kinetics, hydrometallurgical plant, Activox® leaching, autoclave